package com.itheima.d5_interface;

public interface Sing {
    //常量：可以将 public static final 省略
//    public static final double PI = 3.14; //Modifier 'final' is redundant for interface fields
    double PI = 3.14;

    //抽象方法：可以将 public abstract 省略
//    public abstract void singASong(); //Modifier 'abstract' is redundant for interface methods
    void singASong1();
    void singASong2();
}
